3 files changed, 84 insertions, 0 deletions
diff --git a/nixos/tests/activation/etc-overlay-immutable.nix b/nixos/tests/activation/etc-overlay-immutable.nix
new file mode 100644
index 0000000000000..70c3623b929c5
--- /dev/null
+++ b/nixos/tests/activation/etc-overlay-immutable.nix
@@ -0,0 +1,30 @@
+{ lib, ... }: {
+
+  name = "activation-etc-overlay-immutable";
+
+  meta.maintainers = with lib.maintainers; [ nikstur ];
+
+  nodes.machine = { pkgs, ... }: {
+    system.etc.overlay.enable = true;
+    system.etc.overlay.mutable = false;
+
+    # Prerequisites
+    systemd.sysusers.enable = true;
+    users.mutableUsers = false;
+    boot.initrd.systemd.enable = true;
+    boot.kernelPackages = pkgs.linuxPackages_latest;
+
+    specialisation.new-generation.configuration = {
+      environment.etc."newgen".text = "newgen";
+    };
+  };
+
+  testScript = ''
+    machine.succeed("findmnt --kernel --type overlay /etc")
+    machine.fail("stat /etc/newgen")
+
+    machine.succeed("/run/current-system/specialisation/new-generation/bin/switch-to-configuration switch")
+
+    assert machine.succeed("cat /etc/newgen") == "newgen"
+  '';
+}
diff --git a/nixos/tests/activation/etc-overlay-mutable.nix b/nixos/tests/activation/etc-overlay-mutable.nix
new file mode 100644
index 0000000000000..cfe7604fceb84
--- /dev/null
+++ b/nixos/tests/activation/etc-overlay-mutable.nix
@@ -0,0 +1,30 @@
+{ lib, ... }: {
+
+  name = "activation-etc-overlay-mutable";
+
+  meta.maintainers = with lib.maintainers; [ nikstur ];
+
+  nodes.machine = { pkgs, ... }: {
+    system.etc.overlay.enable = true;
+    system.etc.overlay.mutable = true;
+
+    # Prerequisites
+    boot.initrd.systemd.enable = true;
+    boot.kernelPackages = pkgs.linuxPackages_latest;
+
+    specialisation.new-generation.configuration = {
+      environment.etc."newgen".text = "newgen";
+    };
+  };
+
+  testScript = ''
+    machine.succeed("findmnt --kernel --type overlay /etc")
+    machine.fail("stat /etc/newgen")
+    machine.succeed("echo -n 'mutable' > /etc/mutable")
+
+    machine.succeed("/run/current-system/specialisation/new-generation/bin/switch-to-configuration switch")
+
+    assert machine.succeed("cat /etc/newgen") == "newgen"
+    assert machine.succeed("cat /etc/mutable") == "mutable"
+  '';
+}
diff --git a/nixos/tests/activation/perlless.nix b/nixos/tests/activation/perlless.nix
new file mode 100644
index 0000000000000..4d784b4542f45
--- /dev/null
+++ b/nixos/tests/activation/perlless.nix
@@ -0,0 +1,24 @@
+{ lib, ... }:
+
+{
+
+  name = "activation-perlless";
+
+  meta.maintainers = with lib.maintainers; [ nikstur ];
+
+  nodes.machine = { pkgs, modulesPath, ... }: {
+    imports = [ "${modulesPath}/profiles/perlless.nix" ];
+
+    boot.kernelPackages = pkgs.linuxPackages_latest;
+
+    virtualisation.mountHostNixStore = false;
+    virtualisation.useNixStoreImage = true;
+  };
+
+  testScript = ''
+    perl_store_paths = machine.succeed("ls /nix/store | grep perl || true")
+    print(perl_store_paths)
+    assert len(perl_store_paths) == 0
+  '';
+
+}